Im getting this error for a code

MainStocks.java:66: error: cannot find symbol boolean tf = stockName.contains(stName); ^ symbol: method contains(String) location: variable stockName of type String[]

class watchList extends Stocks
    {
        public void watchList()
        {
        System.out.println("Enter Stock Name: ");
        String stName = sc.nextLine();
        stName = stName.toUpperCase();
        boolean tf = stockName.contains(stName);
        for(int i=1;i<=16;i++)
        {

            if (tf == true)
            {
                display(i);
            }
            else
            {
                System.out.println("Stock Not Found!");
            }
        }
        }
        
    }
class MainStocks
    {
        public static void main(String[] args) {
            watchList obj = new watchList();
            obj.watchList();

        }

    }

i tried importing some java utils using some other forum chats, but could’nt figure out how to work around it.